从 sqlite3 中的两个不同数据库中提取列

Question

Is it possible to extract columns from two different database in sqlite3?

My problem is, I have two tables in two different database and I want to retrieve columns from tables from these two database.

To make it more clear, here is my pseudocode.

"SELECT Table_FromFirstDatabase.product 
 FROM MyFirstDatabase.Table_FromFirstDatabase
 WHERE   product NOT IN ('SELECT  Table_FromSecondDatabase.product 
                        FROM MySecondDatabase.Table_FromSecondDatabase');"

Is it possible to do something like this in sqlite3??

Thank you....

Answer 1

You can do that:

ATTACH statements in SQLite.

Note that you could probably use SELECT t1.product FROM db1.tbl1 AS t1 EXCEPT (other select statement) instead of WHERE NOT IN

Answer 2

No. It's probably better for you to pull the data in a local list/array anyways.